ia64/linux-2.6.18-xen.hg

view drivers/serial/8250_hp300.c @ 893:f994bfe9b93b

linux/blktap2: reduce TLB flush scope

c/s 885 added very coarse TLB flushing. Since these flushes always
follow single page updates, single page flushes (when available) are
sufficient.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Jun 04 10:32:57 2009 +0100 (2009-06-04)
parents 831230e53067
children
line source
1 /*
2 * Driver for the 98626/98644/internal serial interface on hp300/hp400
3 * (based on the National Semiconductor INS8250/NS16550AF/WD16C552 UARTs)
4 *
5 * Ported from 2.2 and modified to use the normal 8250 driver
6 * by Kars de Jong <jongk@linux-m68k.org>, May 2004.
7 */
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/string.h>
11 #include <linux/kernel.h>
12 #include <linux/serial.h>
13 #include <linux/serial_core.h>
14 #include <linux/delay.h>
15 #include <linux/dio.h>
16 #include <linux/console.h>
17 #include <asm/io.h>
19 #include "8250.h"
21 #if !defined(CONFIG_HPDCA) && !defined(CONFIG_HPAPCI)
22 #warning CONFIG_8250 defined but neither CONFIG_HPDCA nor CONFIG_HPAPCI defined, are you sure?
23 #endif
25 #ifdef CONFIG_HPAPCI
26 struct hp300_port
27 {
28 struct hp300_port *next; /* next port */
29 int line; /* line (tty) number */
30 };
32 static struct hp300_port *hp300_ports;
33 #endif
35 #ifdef CONFIG_HPDCA
37 static int __devinit hpdca_init_one(struct dio_dev *d,
38 const struct dio_device_id *ent);
39 static void __devexit hpdca_remove_one(struct dio_dev *d);
41 static struct dio_device_id hpdca_dio_tbl[] = {
42 { DIO_ID_DCA0 },
43 { DIO_ID_DCA0REM },
44 { DIO_ID_DCA1 },
45 { DIO_ID_DCA1REM },
46 { 0 }
47 };
49 static struct dio_driver hpdca_driver = {
50 .name = "hpdca",
51 .id_table = hpdca_dio_tbl,
52 .probe = hpdca_init_one,
53 .remove = __devexit_p(hpdca_remove_one),
54 };
56 #endif
58 static unsigned int num_ports;
60 extern int hp300_uart_scode;
62 /* Offset to UART registers from base of DCA */
63 #define UART_OFFSET 17
65 #define DCA_ID 0x01 /* ID (read), reset (write) */
66 #define DCA_IC 0x03 /* Interrupt control */
68 /* Interrupt control */
69 #define DCA_IC_IE 0x80 /* Master interrupt enable */
71 #define HPDCA_BAUD_BASE 153600
73 /* Base address of the Frodo part */
74 #define FRODO_BASE (0x41c000)
76 /*
77 * Where we find the 8250-like APCI ports, and how far apart they are.
78 */
79 #define FRODO_APCIBASE 0x0
80 #define FRODO_APCISPACE 0x20
81 #define FRODO_APCI_OFFSET(x) (FRODO_APCIBASE + ((x) * FRODO_APCISPACE))
83 #define HPAPCI_BAUD_BASE 500400
85 #ifdef CONFIG_SERIAL_8250_CONSOLE
86 /*
87 * Parse the bootinfo to find descriptions for headless console and
88 * debug serial ports and register them with the 8250 driver.
89 * This function should be called before serial_console_init() is called
90 * to make sure the serial console will be available for use. IA-64 kernel
91 * calls this function from setup_arch() after the EFI and ACPI tables have
92 * been parsed.
93 */
94 int __init hp300_setup_serial_console(void)
95 {
96 int scode;
97 struct uart_port port;
99 memset(&port, 0, sizeof(port));
101 if (hp300_uart_scode < 0 || hp300_uart_scode > DIO_SCMAX)
102 return 0;
104 if (DIO_SCINHOLE(hp300_uart_scode))
105 return 0;
107 scode = hp300_uart_scode;
109 /* Memory mapped I/O */
110 port.iotype = UPIO_MEM;
111 port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
112 port.type = PORT_UNKNOWN;
114 /* Check for APCI console */
115 if (scode == 256) {
116 #ifdef CONFIG_HPAPCI
117 printk(KERN_INFO "Serial console is HP APCI 1\n");
119 port.uartclk = HPAPCI_BAUD_BASE * 16;
120 port.mapbase = (FRODO_BASE + FRODO_APCI_OFFSET(1));
121 port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
122 port.regshift = 2;
123 add_preferred_console("ttyS", port.line, "9600n8");
124 #else
125 printk(KERN_WARNING "Serial console is APCI but support is disabled (CONFIG_HPAPCI)!\n");
126 return 0;
127 #endif
128 }
129 else {
130 #ifdef CONFIG_HPDCA
131 unsigned long pa = dio_scodetophysaddr(scode);
132 if (!pa) {
133 return 0;
134 }
136 printk(KERN_INFO "Serial console is HP DCA at select code %d\n", scode);
138 port.uartclk = HPDCA_BAUD_BASE * 16;
139 port.mapbase = (pa + UART_OFFSET);
140 port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
141 port.regshift = 1;
142 port.irq = DIO_IPL(pa + DIO_VIRADDRBASE);
144 /* Enable board-interrupts */
145 out_8(pa + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
147 if (DIO_ID(pa + DIO_VIRADDRBASE) & 0x80) {
148 add_preferred_console("ttyS", port.line, "9600n8");
149 }
150 #else
151 printk(KERN_WARNING "Serial console is DCA but support is disabled (CONFIG_HPDCA)!\n");
152 return 0;
153 #endif
154 }
156 if (early_serial_setup(&port) < 0) {
157 printk(KERN_WARNING "hp300_setup_serial_console(): early_serial_setup() failed.\n");
158 }
160 return 0;
161 }
162 #endif /* CONFIG_SERIAL_8250_CONSOLE */
164 #ifdef CONFIG_HPDCA
165 static int __devinit hpdca_init_one(struct dio_dev *d,
166 const struct dio_device_id *ent)
167 {
168 struct uart_port port;
169 int line;
171 #ifdef CONFIG_SERIAL_8250_CONSOLE
172 if (hp300_uart_scode == d->scode) {
173 /* Already got it. */
174 return 0;
175 }
176 #endif
177 memset(&port, 0, sizeof(struct uart_port));
179 /* Memory mapped I/O */
180 port.iotype = UPIO_MEM;
181 port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
182 port.irq = d->ipl;
183 port.uartclk = HPDCA_BAUD_BASE * 16;
184 port.mapbase = (d->resource.start + UART_OFFSET);
185 port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
186 port.regshift = 1;
187 port.dev = &d->dev;
188 line = serial8250_register_port(&port);
190 if (line < 0) {
191 printk(KERN_NOTICE "8250_hp300: register_serial() DCA scode %d"
192 " irq %d failed\n", d->scode, port.irq);
193 return -ENOMEM;
194 }
196 /* Enable board-interrupts */
197 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
198 dio_set_drvdata(d, (void *)line);
200 /* Reset the DCA */
201 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_ID, 0xff);
202 udelay(100);
204 num_ports++;
206 return 0;
207 }
208 #endif
210 static int __init hp300_8250_init(void)
211 {
212 static int called = 0;
213 #ifdef CONFIG_HPAPCI
214 int line;
215 unsigned long base;
216 struct uart_port uport;
217 struct hp300_port *port;
218 int i;
219 #endif
220 if (called)
221 return -ENODEV;
222 called = 1;
224 if (!MACH_IS_HP300)
225 return -ENODEV;
227 #ifdef CONFIG_HPDCA
228 dio_register_driver(&hpdca_driver);
229 #endif
230 #ifdef CONFIG_HPAPCI
231 if (hp300_model < HP_400) {
232 if (!num_ports)
233 return -ENODEV;
234 return 0;
235 }
236 /* These models have the Frodo chip.
237 * Port 0 is reserved for the Apollo Domain keyboard.
238 * Port 1 is either the console or the DCA.
239 */
240 for (i = 1; i < 4; i++) {
241 /* Port 1 is the console on a 425e, on other machines it's mapped to
242 * DCA.
243 */
244 #ifdef CONFIG_SERIAL_8250_CONSOLE
245 if (i == 1) {
246 continue;
247 }
248 #endif
250 /* Create new serial device */
251 port = kmalloc(sizeof(struct hp300_port), GFP_KERNEL);
252 if (!port)
253 return -ENOMEM;
255 memset(&uport, 0, sizeof(struct uart_port));
257 base = (FRODO_BASE + FRODO_APCI_OFFSET(i));
259 /* Memory mapped I/O */
260 uport.iotype = UPIO_MEM;
261 uport.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
262 /* XXX - no interrupt support yet */
263 uport.irq = 0;
264 uport.uartclk = HPAPCI_BAUD_BASE * 16;
265 uport.mapbase = base;
266 uport.membase = (char *)(base + DIO_VIRADDRBASE);
267 uport.regshift = 2;
269 line = serial8250_register_port(&uport);
271 if (line < 0) {
272 printk(KERN_NOTICE "8250_hp300: register_serial() APCI %d"
273 " irq %d failed\n", i, uport.irq);
274 kfree(port);
275 continue;
276 }
278 port->line = line;
279 port->next = hp300_ports;
280 hp300_ports = port;
282 num_ports++;
283 }
284 #endif
286 /* Any boards found? */
287 if (!num_ports)
288 return -ENODEV;
290 return 0;
291 }
293 #ifdef CONFIG_HPDCA
294 static void __devexit hpdca_remove_one(struct dio_dev *d)
295 {
296 int line;
298 line = (int) dio_get_drvdata(d);
299 if (d->resource.start) {
300 /* Disable board-interrupts */
301 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, 0);
302 }
303 serial8250_unregister_port(line);
304 }
305 #endif
307 static void __exit hp300_8250_exit(void)
308 {
309 #ifdef CONFIG_HPAPCI
310 struct hp300_port *port, *to_free;
312 for (port = hp300_ports; port; ) {
313 serial8250_unregister_port(port->line);
314 to_free = port;
315 port = port->next;
316 kfree(to_free);
317 }
319 hp300_ports = NULL;
320 #endif
321 #ifdef CONFIG_HPDCA
322 dio_unregister_driver(&hpdca_driver);
323 #endif
324 }
326 module_init(hp300_8250_init);
327 module_exit(hp300_8250_exit);
328 MODULE_DESCRIPTION("HP DCA/APCI serial driver");
329 MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>");
330 MODULE_LICENSE("GPL");